Serialize/Deserialize ExtrudeGeometry

HTML

<script src="https://threejs.org/build/three.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer;

init();
animate();

function init() {

  camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 1000 );
  camera.position.set( - 100, 0, 200 );
	camera.lookAt( - 100, 0, 0 );

  scene = new THREE.Scene();
	
  const smiley = getSmileyShape();
	const heart = getHeartShape();
	
  const geometry = new THREE.ExtrudeGeometry( [ smiley, heart ], {
		curveSegments: 24,
		steps: 6,
		amount: 12,
		bevelEnabled: false

	} );
  const material = new THREE.MeshLambertMaterial( { color: 0xffffff } );

  const mesh = new THREE.Mesh( geometry, material );
  mesh.rotation.z = Math.PI;
  mesh.position.set( 45, 45, 0 );
  scene.add( mesh );

	//

	var ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
	scene.add( ambientLight );

	var pointLight = new THREE.PointLight( 0xffffff, 0.8 );
	camera.add( pointLight );
	scene.add( camera );

	//

  renderer = new THREE.WebGLRenderer( { antialias: true } );
  renderer.setSize( window.innerWidth, window.innerHeight );
  renderer.setPixelRatio( window.devicePixelRatio );
  document.body.appendChild( renderer.domElement );

	window.addEventListener( 'resize', resize, false );

}

function resize() {

	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();

	renderer.setSize( window.innerWidth, window.innerHeight );

}

function animate() {

	requestAnimationFrame( animate );
	renderer.render( scene, camera );

}

function getHeartShape() {

	const x = 200, y = 0;

	const heartShape = new THREE.Shape();

	heartShape.moveTo( x + 25, y + 25 );
	heartShape.bezierCurveTo( x + 25, y + 25, x + 20, y, x, y );
	heartShape.bezierCurveTo( x - 30, y, x - 30, y + 35, x - 30, y + 35 );
	heartShape.bezierCurveTo( x - 30, y + 55, x - 10, y + 77, x + 25, y + 95 );
	heartShape.bezierCurveTo( x + 60, y + 77, x + 80, y + 55, x + 80, y + 35 );
	heartShape.bezierCurveTo( x + 80, y + 35, x + 80, y, x + 50, y );
	heartShape.bezierCurveTo( x + 35, y, x + 25, y + 25,...